
$main-color: #008B8B;
$p: 56px;
$bg: 'background-color';

* { 
    box-sizing: border-box;
}

a{
    color: $main-color;
    font-size: $p + 1;
    p {
        #{$bg}: $main-color;
    }
}

b {
    @extend a;
}